As can be seen from the the upper table, after five measurements, the average measured distance is 193.959m, which is close to the actual distance. The average error is 3.27% and the standard deviation is 6.011m, which is acceptable to a certain extent. Obviously, the positioning system of the design is relatively stable and reliable. So it can be applied to the monitoring system of transportation of dangerous goods. In terms of error, the influencing factors may be: weather condition which can affect signals, manual measurement, because the 200m is measured by the tester and the speed of the car also should be considered because we can not control the speed of the car precisely. Due to constraints of time and simulation conditions, not all these factors have been tested at present. After all, BDS has inherent error. More in-depth discussion relies on a more in-depth study and more test of the design in the future.